8 Then Judah said to Onan, “Sleep with your brother’s wife. Perform your duty as her brother-in-law and raise up offspring for your brother.”
Genesis 38:8 Cross References - BSB
Leviticus 18:16
16 You must not have sexual relations with your brother’s wife; that would shame your brother.
Numbers 36:8-9
8 Every daughter who possesses an inheritance from any Israelite tribe must marry within a clan of the tribe of her father, so that every Israelite will possess the inheritance of his fathers.
9 No inheritance may be transferred from one tribe to another, for each tribe of Israel must retain its inheritance.”
Deuteronomy 25:5-10
5 When brothers dwell together and one of them dies without a son, the widow must not marry outside the family. Her husband’s brother is to take her as his wife and fulfill the duty of a brother-in-law for her.
6 The first son she bears will carry on the name of the dead brother, so that his name will not be blotted out from Israel.
7 But if the man does not want to marry his brother’s widow, she is to go to the elders at the city gate and say, “My husband’s brother refuses to preserve his brother’s name in Israel. He is not willing to perform the duty of a brother-in-law for me.”
8 Then the elders of his city shall summon him and speak with him. If he persists and says, “I do not want to marry her,”
9 his brother’s widow shall go up to him in the presence of the elders, remove his sandal, spit in his face, and declare, “This is what is done to the man who will not maintain his brother’s line.”
10 And his family name in Israel will be called “The House of the Unsandaled.”
Ruth 1:11
11 But Naomi replied, “Return home, my daughters. Why would you go with me? Are there still sons in my womb to become your husbands?
Ruth 4:5-11
5 Then Boaz said, “On the day you buy the land from Naomi and also from Ruth the Moabitess, you must also acquire the widow of the deceased in order to raise up the name of the deceased on his inheritance.”
6 The kinsman-redeemer replied, “I cannot redeem it myself, or I would jeopardize my own inheritance. Take my right of redemption, because I cannot redeem it.”
7 Now in former times in Israel, concerning the redemption or exchange of property, to make any matter legally binding a man would remove his sandal and give it to the other party, and this was a confirmation in Israel.
8 So the kinsman-redeemer removed his sandal and said to Boaz, “Buy it for yourself.”
9 At this, Boaz said to the elders and all the people, “You are witnesses today that I am buying from Naomi all that belonged to Elimelech, Chilion, and Mahlon.
10 Moreover, I have acquired Ruth the Moabitess, Mahlon’s widow, as my wife, to raise up the name of the deceased through his inheritance, so that his name will not disappear from among his brothers or from the gate of his home. You are witnesses today.”
11 “We are witnesses,” said the elders and all the people at the gate. “May the LORD make the woman entering your home like Rachel and Leah, who together built up the house of Israel. May you be prosperous in Ephrathah and famous in Bethlehem.
Matthew 22:23-27
23 That same day the Sadducees, who say there is no resurrection, came to Jesus and questioned Him.
24 “Teacher,” they said, “Moses declared that if a man dies without having children, his brother is to marry the widow and raise up offspring for him.
25 Now there were seven brothers among us. The first one married and died without having children. So he left his wife to his brother.
26 The same thing happened to the second and third brothers, down to the seventh.
27 And last of all, the woman died.